So a solution, that will get better from where I have it now, it is quick and easy, does not give you much, maybe 10-15mm but is noticeable, particularly if you need that space for a lid!
1. Take seat out.
2. Remove joggle type solid insert from the front of the runners.
3. Flip the joggle so it is upside down from the way it is originally installed, and insert into the rear of the runner.
4. Make sure that you also flip the runner hex bolts from front to rear as well otherwise the seat will not slide
5. Refit seat
I reckon I now have just 5mm between my seat and the floor, maybe less, my plan is to machine 5mm off the joggle (it appears massively over engineered) and then re-install the seat and add a mm shim as required until the seat slides, thus the seat could not go any lower than I will have set it.
I hope this helps some people out there, I understand if you do not want to do the milling bit, I am going to run some FEA on the joggle before I do it.
The only way to get it lower would be to get a different seat design like a B5 or something like that. But that is less padding...
All the best
Tim